Reimplement the SIMD and FP instruction decoder, so as to avoid huge
amounts of duplicated decode, and to follow the documentation more
closely.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2871 8f6e269a-dfd6-0310-a8e1-e2731360e62c
Move remaining implemented SIMD instructions into the new SIMD/FP
decoding framework.


git-svn-id: svn://svn.valgrind.org/vex/trunk@2872 8f6e269a-dfd6-0310-a8e1-e2731360e62c